Disintegrator drilling device



Patented Feb. 17, 1948 DISINTEGRATOR DRILLING DEVICE Edward J. Dobie and Aloise F. Raymonrl, Robbinsdale, Minn.

Application April 2, 1945, Serial N0. 586,174

2 Claims.

Our invention re1ates to a. device for removing broken dri1ls taps, reamers, and the like, from machined metal parts, and has for its primary object the construction cf a device of this type which is more efficient than any device heretofore built.

Another object of our invention is the provision of a machine of this type which can be operated with a minimum of skil1 and. training and which is durable and foolproof.

Another object of our invention is the coustruction of such a device Which is clean in operation and which operates n the work With greater speed than any such device heretofore constructed.

Another objectof our invention is the provision of such a. device at a minimum cost.

More specifically our invention is a drilling machine of the electric arc disintegrator type wherein a reciprocating electrode, upon periodic contacts with the metal, causes sparks to fiy a:nd oxidize out almost molecular-size particles of metal. In our particular device these particles are carried away by a stream 01 fiuid, preferably an, which also has the important function of dissipating the -heat from the work.

'Ihe above and other objects Will become apparent from the following detailed description and attached drawings wherein like characters indicate like -parts throughout the several views:

Referring 130 I;he drawings:

Fig. 1 is -a side elevation of our novel construction, some parts being broken -away and shown in vertical axial section;

Fig. '2 is a. top p1an view of the device shown in Fig. 1;

Fig. 3 -is an end elevation 0f the device shown in Fig. 1 looking from left to right;

Fig. 4 is an enla.rged fragmentary view of the air motor;

.Fig. 5 is a vertical sectional view taken 011 the 1ine 55 of Fig. 4;

Fig. 6 is an enlarged fragmentary view of the modified form of air motor, some parts being br-oken away;

Fig. 7 is a vertical axial section 'taken on ehe line I-7 cf Fig. 6; und.

'8 is an enlarged fragmentary view tanken an I;he line 3--8 .of Fig. 1.

The letter A indicates a machined metallic part or -work into which the end of a broken tap or the 11ke B, has become lodged.

The numeral I indica-tes a work receiving base or bed -through which projects an upright supporting member 2. Bad I 'is insulated from supporting member 2 at 4. for a purpose which will hereinafter become apparent. Supporting post 2 is shown as being round in cross section. Loosely journalled on supporting post 2 for rotary and up and down movements is a s1eeve 5 which may be sscured in any desired position on the shaft by means of a thumb screw or the like 6.

Shown as projecting laterally from s1eeve 5 is an arm I on the outer end of which is another tubular sleeve 8 which, as shown, is substantially vertical and parallel sleeve 5. The upper and lower ends of tubular member 8 are provided with spaced bearings 9 anal II! which have concentrlc, but restricted openings therein, which communicate with the interfi-or cf the tubular member 8.

A tubu1ar 13001 carrying head II projects snugly through uppr and 1ower bearings 9 and I0 and loosely through the enlarged portion of tubular member 8 so as to provide an air chamber I2 between said bearings 9 am). I9. II: will be noted that tubular tool carrying head II is mounted in bearings 9 and I9 cf tubular s1eeve 8 for compound rotary and axial oscillatory movements.

A disintegrator electrode, shown as beim; in the form of a tubular nozzle I3 is rigidly secured to I;he bottom end of tubular head H b.v means of a knurled collar 01 I;he like I4 which makes screwthreaded engagement with tubular head II.

Shown as being mounted an the opposite o1 upper end of tubular member II is a housing I5 having a removab1e front cover platze I5. Enca.sed in housing I5 are a. pa.ir of horizontallydisposed loosely meshing gears I'I. Gears I'I are eccentrically weighted at I8 and are journalled on pins I9 which extend from back to front through housing I5 so as to keep removable cover I6 in place. As will be seen, pins I9 are provided with enlarged heads 20 at I;he back, and with screwthreaded burrs 2l ab the front. 'I'he teeth of gear I'I are identified by the numeral I'Ia.

It will be observed that housing I5 is mounted on tubular 13001 carrying head I I in a manner, as shown in Fig. 4, so that the port 22 communicating therebetween is immediately be1ow the point of meshing engagement with the gears l'l. The amount of air entering the interior of housing I 5 through port 22 is regulated by thumb screw 22a. Cover p1ate I6 is shown as provided with an opening 23 which communicates with the interior cf the housing and exhausts to the atmosphere at; a point radially spaced from the axis of the head.

Referring now to the modified structure shown in ;Figs. 6 and "I, it Will be noted that a housing 38 is rigidly secured to I1he .to p 611d. oi :fiub1.1lar

. 3 tool carrying head II. Housing 38 is equipped on one face thereof With a removable, vertically disposed cover platze 33, which is held in place by a pair of laterally disposed threaded bolts 48 which make engagement with a. pair of outwardly projecting, integra.lly formed ears 4I on either side of the housing 38. Mounted in housing 38 is a. gear 42 which is counterweighted at 43. Gea.r 42 has teeth 44 a.nd is mounted for rota.tion on a shaft 45 which extends through the opening in che center of the gear. A reduced end 46 of shaft.

45 extends through an opening in the back df housing 33 and is secured fast in a boss 4'I. Bearings 48 m-ay be utilized to facilitate rota.tion of I;he gear 42.

A diagonally extending passage way 43 counects tubular tool carrying head II and interior of housing 38. The volume of air passing through port 49 is controlled by a hea.ded screw '58. An exhaust; port 5I is provided in the removable cover Platte 39.

Shown as being connected to sleeve 5 by means of a Clip 24, or the like, is ari air hose 25 which connects to a. source of a1r pressure not shown. Air tube 25 communicates with chamber I2 in sleev8 by means of a'port 26 after passing thrbugh a v'alve 27 which controlg the volume of air Passing therethropgh by means of a needle va.lve or the like28, having am enlarged thumb Iiut 29 a1; its exterior end. II; Will be noted that tubular tool carryinghead II h2.s a. centrally located port 33 which communicates between the air chamber I2 and the interior of the tuular hea.d II.

Arcing current may be sup*lied from any stable source subh as a step down transformer T, the 10W voltage winc ling' of which is irdicated 3y a. In accordance with the present example, one end of the secondary a of the transformer T is connebted to the electrode I3, through t-.e hea" II a. brush b and a cabl-e lea:1 c; and I;he broken tap B is connected at the o'sher end of the transformer winding a through the work A. the W01k becl I and grou nd connections indicated ab d anal e, respectively.

As indicated hrush b is kept in constant frietional co ntact With reciprocating tubular haad II by means of a coil spring, er the like 3I, interposed between the bottom side f arm I anc1 a laterally projecting finger 32, which ca.rries b1ush b in a, co11ar 33. As shown, brush b is held secure in collar 33 by a set screw 34. Arm 32 is pivoted at 35 to a depencling bracket 36, which in turn, is secured to the bottom of arm 7 by meang cf threaded bolts 3'I, or the like.

' Operation as 130 allow the desired amount of air pressure to enter chamber l2. The air in chamber I2 enters tubular 1:001 carrying head I I thro1i'gh po'rt 38 a.nd expands both upwa.rd and. downvvard Iaherethrough. The air that goes upward through tubgla.r head II enters the gear housing I through restricted port 22 50 that the stream 'of air, which is still under considerable pressure. impinges updri the intermesh-ing te.eth 'I'Ia 0f gears I'I. Thug, gears I'I are rotated in opposite directions as indicated by the arrows in Fig. 4. Rotation of gears I'I causes a reciprocatiou of the housing I5, the tubular too1 carrying head II and the disintegrator nozzle I3 because of the counterweights I8.

AI; this point it is believed important to point out that the speed of rotation of gears I'I, and hence the speed of reciprocation of I;he housing I5, hea.d II and nozzle I3, all of which are tied together, may be varied, as above pointed out, by adjustment of the needle valve 28.

The air stream which enters gea.r housing I5 through port 22, after impa.rting a rotary motion eXhaugtport 23 is located ab a. point radially spaced from the axis of Ishe head II, a fluid pressure motor is produced which imparts a constant rotary motion of the housing I5, tubular head II and disintegrator nozzle I3.

The air under pressure which takes a. downward Course through tubular head II after entering I:he same through port 30, discharges to atmosphere through tubul-ar disintegrator nozzle I3.

II: will thus Ioe Seen that when an arcing eurrent is supplied, as above described, periodic arcings will be produced as the reciprocating nozzle I3 contacts the broken tap, or the like B. The fiying bits of White hob meta.l which result from each arcing a.re quickly blown away by the stream of air exhausting through the nozzle I3. Furthermore, the constant stream of air exhausting through nozzle I3 keeps the end of the nozzle cool as well as preventing the broken tap B from becoming so hot as to damage machined piece A into which ta.p B has become lodged.

Theconstant rotary motion of I.he nozzle we have found to be very much of an aid in the preventing of red hot portions of metal becoming secured to the nozzle I3. Also we have found that this rotary motion of the nozzle prevents uneven burning of I;he nozzle.

The operation of the modified air motor and reciprocating device shown in Figs. 6 and "I, is very similar to that above described namely: air under pressure goes upward through tubular head II, through the angularly disposed passageway 49 am} comes to bear upon the teeth 44 of the gear 42 in a manner to cause the Same I;d be rota.ted in a counterclockwise direction. Counterweight 43 obviously imparts axial reciprocal movementg to the I:ubular head II, housing 38 ana disintegrator nozzle I3 as, gear 42 rotates. The air then exhausts I:o atmosphere through port 5I in removable cover plate 39. Port 5I, like port 23 in housing I5, is radially spaced from the axis cf the tubular head II so I;hat the air exhausting therethrough produces a rotary motion of the housing 38, tubular head II and disintegrator nozzle I 3.

What we cla.im is:

1. In a. drilling ma'chihe of the electric am diS-' integrator Izype, a supporting structure, a. tool carrying head mounted on the 'supporting struc-' ture for compour'1d rotary and axial reciprocating movements, a tool in the nature of a disintegrating electrode carried by the head, a. vibrator weight journalled on said head to produce axial reciprocation of the head upon rotation cf I;he weight, anal a fluid pressure motor mounted -on seid head and driving said vibrator weight, said fluid pressure operated motor having a fiuid passage exhausting to. atmosphere ata poin t ;a.c lial- 5 Iy offset from the axis of the head and in a d!- rection to produce rotary motion of the head.

2. In a drilling machine of the electric am disintegrator type, a supporting body having spaced bearings and a chamber intermediate said bearings, a. tubular tool carrying head projecting through said chamber and bearings and guided by the latter for compound rotary and axial reciprocating movements, a tool in the natura of a tubular disintegrtor electrode carried by said head and internally communicating with the in-' terior of the tubular head, a vibrator weight journalled on said head and producing axial reciproca.tion of the head upon rotation of the weight, a fluld passage leading from the chamber of said head and adapted 1:0 be connected to a source 0I fluid pressure, a.nd a fluid pressure motor mounted on said head and said vibrator weight,

6 said fluid pressure operated motor lnvolving a passage communicating with the interior o! said head ab one end anti exhausting to atmosphere at its other end. ab a point radially spaced from 5 the axis of the head and in a direction 120 produce rotary motion of the head.

EDWARD J. DOBIE. ALOISE F. RAYMOND.

REFERENCES CI'I'ED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2385665 Warwick Sept. 25, 1945 1,984809 Requa Dec. 18, 1934 

